Eye irritation with 7.5 pH and 0 CC?

[Spensar]

How do you increase the TDS if it is low? I have a vinyl pool and have always ignored TDS.

[waterbear]

Add salt.
Many pool owners add enough to reach around 2000 ppm and report a increase in bather comfort. There has been discussion about this in the past on the forum and on other forums and I don't remember anyone ever regretting adding salt.

[BigTallGuy]

Can you post the rest of your readings, like CYA and FC for starters?

[PoolDoc]

Attaching Chem_Geek's papers:

Effect of saline on the eye irritation caused by swimming-pool water, 1973

Fluorophotometric measurement of pH of human tears in vivo, 1997
http://www.ncbi.nlm.nih.gov/pubmed/9154387

Ben

[Spensar]

Add salt.
Many pool owners add enough to reach around 2000 ppm and report a increase in bather comfort.

That's 2000 ppm of salt, not a TDS reading?

Apologies if I am re-treading old ground. When I search for TDS, it's to short to be used by the search function.

[waterbear]

That's 2000 ppm of salt, not a TDS reading?

.

That's correct.

[chem geek]

In practice, TDS and salt at such higher levels will be very close -- usually the TDS is around 200 ppm higher than the salt level, but this depends a lot on how TDS is measured and usually it isn't measured accurately (since you have to know the components of the water to properly calculate TDS in ppm). So just use a decent salt test and calculate the amount to add based on salt ppm (you can use The Pool Calculator for that).